BANGKOK — Thai Prime Minister Paetongtarn Shinawatra was admitted to hospital with a high fever shortly after returning from an official visit to Cambodia, a government spokesperson said Friday.Paetongtarn travelled to Cambodia this week for a two-day visit, during which she met Prime Minister Hun Manet to discuss cross-border cooperation on issues such as online scams and air pollution.The two leaders also discussed leveraging Asean as a platform to negotiate with US President Donald Trump on trade tariffs.